<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
<meta http-equiv="X-UA-Compatible" content="IE=9"/>
<meta name="generator" content="Doxygen 1.8.14"/>
<meta name="viewport" content="width=device-width, initial-scale=1"/>
<title>LibQQt: R:/Develop/a0-develop/LibQQt/src/exquisite/qrcode/qrdecode/zxing/bigint/BigIntegerUtils.hh Source File</title>
<link href="tabs.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript" src="dynsections.js"></script>
<link href="search/search.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="search/searchdata.js"></script>
<script type="text/javascript" src="search/search.js"></script>
<link href="doxygen.css" rel="stylesheet" type="text/css" />
</head>
<body>
<div id="top"><!-- do not remove this div, it is closed by doxygen! -->
<div id="titlearea">
<table cellspacing="0" cellpadding="0">
 <tbody>
 <tr style="height: 56px;">
  <td id="projectlogo"><img alt="Logo" src="logo.png"/></td>
  <td id="projectalign" style="padding-left: 0.5em;">
   <div id="projectname">LibQQt
   &#160;<span id="projectnumber">v3.1</span>
   </div>
   <div id="projectbrief">开源、跨平台Qt应用程序框架中间件</div>
  </td>
 </tr>
 </tbody>
</table>
</div>
<!-- end header part -->
<!-- Generated by Doxygen 1.8.14 -->
<script type="text/javascript">
/* @license magnet:?xt=urn:btih:cf05388f2679ee054f2beb29a391d25f4e673ac3&amp;dn=gpl-2.0.txt GPL-v2 */
var searchBox = new SearchBox("searchBox", "search",false,'Search');
/* @license-end */
</script>
<script type="text/javascript" src="menudata.js"></script>
<script type="text/javascript" src="menu.js"></script>
<script type="text/javascript">
/* @license magnet:?xt=urn:btih:cf05388f2679ee054f2beb29a391d25f4e673ac3&amp;dn=gpl-2.0.txt GPL-v2 */
$(function() {
  initMenu('',true,false,'search.php','Search');
  $(document).ready(function() { init_search(); });
});
/* @license-end */</script>
<div id="main-nav"></div>
<!-- window showing the filter options -->
<div id="MSearchSelectWindow"
     onmouseover="return searchBox.OnSearchSelectShow()"
     onmouseout="return searchBox.OnSearchSelectHide()"
     onkeydown="return searchBox.OnSearchSelectKey(event)">
</div>

<!-- iframe showing the search results (closed by default) -->
<div id="MSearchResultsWindow">
<iframe src="javascript:void(0)" frameborder="0" 
        name="MSearchResults" id="MSearchResults">
</iframe>
</div>

<div id="nav-path" class="navpath">
  <ul>
<li class="navelem"><a class="el" href="dir_68267d1309a1af8e8297ef4c3efbcdba.html">src</a></li><li class="navelem"><a class="el" href="dir_14bafaf81b4d5a7e53bf81c33f47f3f2.html">exquisite</a></li><li class="navelem"><a class="el" href="dir_4653d68db7f6be9ae8b828dd23d15f2b.html">qrcode</a></li><li class="navelem"><a class="el" href="dir_5b6dac9498515492da15d3ccc64e1528.html">qrdecode</a></li><li class="navelem"><a class="el" href="dir_01f5014cb6e69ac7af2227b1cb590c8a.html">zxing</a></li><li class="navelem"><a class="el" href="dir_bb9e4a6f0469a7a28da182e8c71e7fc7.html">bigint</a></li>  </ul>
</div>
</div><!-- top -->
<div class="header">
  <div class="headertitle">
<div class="title">BigIntegerUtils.hh</div>  </div>
</div><!--header-->
<div class="contents">
<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="preprocessor">#ifndef BIGINTEGERUTILS_H</span></div><div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;<span class="preprocessor">#define BIGINTEGERUTILS_H</span></div><div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;</div><div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="preprocessor">#include &quot;BigInteger.hh&quot;</span></div><div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="preprocessor">#include &lt;string&gt;</span></div><div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="preprocessor">#include &lt;iostream&gt;</span></div><div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;</div><div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;<span class="comment">/* This file provides:</span></div><div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;<span class="comment"> * - Convenient std::string &lt;-&gt; BigUnsigned/BigInteger conversion routines</span></div><div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;<span class="comment"> * - std::ostream &lt;&lt; operators for BigUnsigned/BigInteger */</span></div><div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;</div><div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;<span class="comment">// std::string conversion routines.  Base 10 only.</span></div><div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;std::string bigUnsignedToString(<span class="keyword">const</span> <a class="code" href="class_big_unsigned.html">BigUnsigned</a> &amp;x);</div><div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;std::string bigIntegerToString(<span class="keyword">const</span> <a class="code" href="class_big_integer.html">BigInteger</a> &amp;x);</div><div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;<a class="code" href="class_big_unsigned.html">BigUnsigned</a> stringToBigUnsigned(<span class="keyword">const</span> std::string &amp;s);</div><div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;<a class="code" href="class_big_integer.html">BigInteger</a> stringToBigInteger(<span class="keyword">const</span> std::string &amp;s);</div><div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;</div><div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;<span class="comment">// Creates a BigInteger from data such as `char&#39;s; read below for details.</span></div><div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt;</div><div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;<a class="code" href="class_big_integer.html">BigInteger</a> dataToBigInteger(<span class="keyword">const</span> T* data, BigInteger::Index length, BigInteger::Sign sign);</div><div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;</div><div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;<span class="comment">// Outputs x to os, obeying the flags `dec&#39;, `hex&#39;, `bin&#39;, and `showbase&#39;.</span></div><div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;std::ostream &amp;operator &lt;&lt;(std::ostream &amp;os, <span class="keyword">const</span> <a class="code" href="class_big_unsigned.html">BigUnsigned</a> &amp;x);</div><div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;</div><div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;<span class="comment">// Outputs x to os, obeying the flags `dec&#39;, `hex&#39;, `bin&#39;, and `showbase&#39;.</span></div><div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;<span class="comment">// My somewhat arbitrary policy: a negative sign comes before a base indicator (like -0xFF).</span></div><div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;std::ostream &amp;operator &lt;&lt;(std::ostream &amp;os, <span class="keyword">const</span> <a class="code" href="class_big_integer.html">BigInteger</a> &amp;x);</div><div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;</div><div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;<span class="comment">// BEGIN TEMPLATE DEFINITIONS.</span></div><div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;</div><div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;<span class="comment">/*</span></div><div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;<span class="comment"> * Converts binary data to a BigInteger.</span></div><div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;<span class="comment"> * Pass an array `data&#39;, its length, and the desired sign.</span></div><div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;<span class="comment"> *</span></div><div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;<span class="comment"> * Elements of `data&#39; may be of any type `T&#39; that has the following</span></div><div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;<span class="comment"> * two properties (this includes almost all integral types):</span></div><div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;<span class="comment"> *</span></div><div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;<span class="comment"> * (1) `sizeof(T)&#39; correctly gives the amount of binary data in one</span></div><div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;<span class="comment"> * value of `T&#39; and is a factor of `sizeof(Blk)&#39;.</span></div><div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;<span class="comment"> *</span></div><div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;<span class="comment"> * (2) When a value of `T&#39; is casted to a `Blk&#39;, the low bytes of</span></div><div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;<span class="comment"> * the result contain the desired binary data.</span></div><div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;<span class="comment"> */</span></div><div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt;</div><div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;<a class="code" href="class_big_integer.html">BigInteger</a> dataToBigInteger(<span class="keyword">const</span> T* data, BigInteger::Index length, BigInteger::Sign sign) {</div><div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;    <span class="comment">// really ceiling(numBytes / sizeof(BigInteger::Blk))</span></div><div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;    <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> pieceSizeInBits = 8 * <span class="keyword">sizeof</span>(T);</div><div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;    <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> piecesPerBlock = <span class="keyword">sizeof</span>(BigInteger::Blk) / <span class="keyword">sizeof</span>(T);</div><div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;    <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> numBlocks = (length + piecesPerBlock - 1) / piecesPerBlock;</div><div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;</div><div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;    <span class="comment">// Allocate our block array</span></div><div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;    BigInteger::Blk *blocks = <span class="keyword">new</span> BigInteger::Blk[numBlocks];</div><div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;</div><div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;    BigInteger::Index blockNum, pieceNum, pieceNumHere;</div><div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;</div><div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;    <span class="comment">// Convert</span></div><div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;    <span class="keywordflow">for</span> (blockNum = 0, pieceNum = 0; blockNum &lt; numBlocks; blockNum++) {</div><div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;        BigInteger::Blk curBlock = 0;</div><div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;        <span class="keywordflow">for</span> (pieceNumHere = 0; pieceNumHere &lt; piecesPerBlock &amp;&amp; pieceNum &lt; length;</div><div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;            pieceNumHere++, pieceNum++)</div><div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;            curBlock |= (BigInteger::Blk(data[pieceNum]) &lt;&lt; (pieceSizeInBits * pieceNumHere));</div><div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;        blocks[blockNum] = curBlock;</div><div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;    }</div><div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;</div><div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;    <span class="comment">// Create the BigInteger.</span></div><div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;    <a class="code" href="class_big_integer.html">BigInteger</a> x(blocks, numBlocks, sign);</div><div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;</div><div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;    <span class="keyword">delete</span> [] blocks;</div><div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;    <span class="keywordflow">return</span> x;</div><div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;}</div><div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;</div><div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;<span class="preprocessor">#endif</span></div><div class="ttc" id="class_big_unsigned_html"><div class="ttname"><a href="class_big_unsigned.html">BigUnsigned</a></div><div class="ttdef"><b>Definition:</b> BigUnsigned.hh:13</div></div>
<div class="ttc" id="class_big_integer_html"><div class="ttname"><a href="class_big_integer.html">BigInteger</a></div><div class="ttdef"><b>Definition:</b> BigInteger.hh:13</div></div>
</div><!-- fragment --></div><!-- contents -->
<!-- start footer part -->
<hr class="footer"/><address class="footer"><small>
Generated by &#160;<a href="http://www.doxygen.org/index.html">
<img class="footer" src="doxygen.png" alt="doxygen"/>
</a> 1.8.14
</small></address>
</body>
</html>
